Helm boldt



(Model.)

P. W. BoLDT an P. 0. A. VOGEL.

-DOOR CHECK. No. 252,993. Pa'tentedJan. 31,1882.

NITED STATES PATENT OFFICE.

FRIEDRICH W. BOLDT AND PETER C. A. VOGEL, OF HAMBURG, GERMANY.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 252,993, dated January 31, 1882;

Application filed September 14, 1881. (Model.) Patented in Germany November 24, 1880, and June 3, 1881.

To all whom it may concern:

Be it known that we, FRIEDRICH WIL- HELM BoLDT and PETER CHRISTIAN ANTON VOGEL', citizens of the German Empire and Denmark, respectively, residing at Hamburg, in the German Empire, have invented new and useful Improvements in Door-Checks,of which the following is a specification.

rllhis invention consists in the combination, with a locking-plate, of a hinged check-bar, a pear-shaped slot in said check-bar, an incline formed on one edge of the check-bar, and a latch with aspring-bolt having a conical or beveled head, so that when the door is closed the bolt engages automatieallywith the checkbar.

It is a well-known fact that door-checks would b'e used much more extensively than they are at present if, in addition to their great advantages of forming a protection against sneak-thieves, beggars, and ot' allowing corn- Innnieation with p'ersons outside without giving them admission into the house, such doorchecks were free from the disadvantage or inconvenience-viz., that if a person opens the door in going out, the door-check must necessarily be disengaged, and in most cases a seeond person is required to throw the door-check again into action, or the person having opened the door must perform this operation by means of a key or otherwise, and if this operation is forgotten the door-check becomes useless. In

order to overcome this\disadvantage,we have constructed a door-checkvwhich is automatically thrown in a position to operate by the act of closing the door.

This invention is illustrated in the accompanying drawings, in which Figure 1 represents an inside view ot' a door provided with our door-check. Fig. 2 is a horizontal section ofthe same in the plane x x, Fig. 1. Fig. 3 is a face view of the lock-plate, showing the hinged check/-bar partly raised. Fig. 4 is a horizontal section in the plane y y, Fig. 3. Fig. 5 is an inside view of the latch. Fig. 6 is a transverse vertical section of the same.

Similar letters indicate corresponding parts.

In the drawings, the letterA designates the locking plate, which is provided with a hinged check-bar, B. In this check-baris a pear-shaped slot, a, and from its edge projects an incline, b. When the check-bar is free to follow its inherent gravity it drops into a slot formed for its reception in the locking-plate, as shown in Figs. l and 2.

C is the latch, which is provided with a bolt, D, that is subjected to the action of a spring, o, having a tendency to throw the bolt in the position shown in Figs. l, 2, and 5. The bolt can be moved back against the action of its spring by a button, d, on the inside, or by a key, K, from the inside, of the door. Thehead e of the bolt is conical or beveled, and when the door is closed it rides up on the incline b of the check-bar B, and after having passed this incline it passes through the large end of the pear-shaped slot a. If the door is now opened without throwing back the bolt D, said bolt throws the check-bar up into the position `shown in Fig. 3, and as the body of the bolt slides out into the narrow part of the slot a,

the head e catches behind the edges of said slot, and the door can only be opened as far as the check-bar will permit. If a person desires to go out of the door, the bolt D is pressed back by means of the button d, and when the door is closed the head of the bolt engages again automatically with the slot a of the check-bar. In the same manner a person provided with a proper key can throw the boltD back from the outside, and after entering and closingthe door the door-checkisautomatically thrown in operation.

From this description it will be seen that our door-check is always in proper position for operation, and at the same time persons provided with a proper key can enter without/the aid of a second person.l

Ve do not claim broadly as our invention a door-check composed of a latch and a hinged gravitating check-bar, such being well-known.

What we claim as new, and desire to secure by Letters Patent, is-

The combination, substantially as hereinbefore described, of the lookin gplate, the checkbar hinged therein, the pear-shaped slot in said check-bar, the incline formed on one edge of the check-bar, and the spring-bolt having a conical or beveled head.

In testimony whereof we have hereunto set our hands and seals in the presence of two subseribin g witnesses.

' FRIEDRICH WILHELM BOLDT. L. s] PETER CHRISTIAN ANTON VOGEL. L. s]

Witnesses:

PAUL MLLER, H. SCHRADER.

IOO 

